Commitments and Contingencies (Narratives) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]
Allowance for unfunded lending commitments	$ 4,900,000	$ 5,400,000	$ 5,400,000
Short-term guarantees	55,100,000
Allowance for loan loss associated with loans sold with recourse	2,700,000	2,700,000	1,700,000
Financing Receivable, Repurchase Reserve	2,738,000	2,667,000	1,678,000	1,743,000
Residential Mortgage [Member]
Loss Contingencies [Line Items]
Financing Receivable, Loans Sold to Third Party Investors	34,900,000	32,500,000	17,200,000
Financing Receivable, Repurchase Reserve	1,600,000	1,500,000	400,000	470,000
Manufactured Housing [Member]
Loss Contingencies [Line Items]
Financing Receivable, Loans Sold to Third Party Investors	8,200,000	8,200,000	10,700,000
Financing Receivable, Repurchase Reserve	$ 1,138,000	$ 1,167,000	$ 1,278,000	$ 1,273,000